落叶松人工林空间结构优化的探讨

Discussion on Optimization of Forest Spatial Structure of Larix olgensis Plantation

基于落叶松(Larix olgensis Henry)人工林固定标准地ML707的每木检尺数据,针对人工林普遍具有混交度低,分布均匀的特点。主要从林分竞争机制和树冠营养空间利用情况等方面提出了利用Hegyi竞争指数、生长空间指数、生长空间竞争指数分析优化林分空间结构,进一步比较了不同择伐强度下林分空间结构变化的大小。研究结果表明:14%左右为林分最优的择伐强度,空间优化达到最佳,优化后林分竞争态势减小,营养空间利用程度增大,林分空间结构得到改善。

Spatial structure of Larix olgensis plantation was studied based on the pertree survey data of sampling plot ML707 and the common characteristics of low mixture degree and uniform distribution in L. olgensis plantation. In consideration stand competition mechanism and the utilization of the nutrition space of the crown, this article proposed a new method using Hegyi competition index （CI）, Growth space index（GSI） and Growth space competition index（GSCI） to analyze and optimize the spatial structure. Further comparisons of stand spatial structure were made in terms of different selective cutting intensity. The results showed that the optimal Selective cutting intensity is about 14 percent at which the optimization of forest spatial structure is achieved. After optimization, the forest competition situation reduced, nutrition space utilization increased and forest spatial structure got improved.